Blow molding film processing wholesale process generally follows this workflow:

Hopper feeding one material → plasticizing extrusion → blowing and stretching → air ring cooling → V-shaped clamp → traction roller traction → corona treatment → film winding

However, it is worth noting that the performance of blow molding processing wholesale film is greatly related to the production process parameters. Therefore, during the film blowing process, it is necessary to strengthen the control of process parameters, standardize process operations, ensure the smooth progress of production, and obtain high-quality film products. In the production process of polyethylene blow molding wholesale film, the main control points for process parameters include:

Extruder temperature

During the blow molding process of low-density polyethylene (LDPE) film, the extrusion temperature is generally maintained between 160℃ and 170℃, and it is essential to ensure uniform die head temperature. Excessive extrusion temperature can lead to resin decomposition, making the film brittle and significantly reducing its longitudinal tensile strength. On the other hand, if the temperature is too low, the resin will not be properly plasticized, preventing smooth expansion and stretching. The film's tensile strength will be low, and its surface will lack luster and transparency, possibly developing patterns resembling wood grain and unmelted crystal nuclei (fish eyes).

2. Blowing Ratio

Blow-up ratio is one of the key controls in the production process of blown film for wholesale plastic processing, referring to the ratio between the diameter of the bubble after inflation and the diameter of the uninflated tube ring. The blow-up ratio represents the lateral expansion multiple of the film, which is essentially a form of lateral stretching of the film. This stretching exerts an orientation effect on the plastic molecules to a certain degree; as the blow-up ratio increases, the lateral strength of the film improves. However, the blow-up ratio should not be too high, as it may lead to instability in the bubble and cause the film to wrinkle easily. Therefore, the blow-up ratio should be coordinated with the draw ratio appropriately. Generally speaking, the blow-up ratio for low-density polyethylene (LDPE) film should be controlled between 2.5 and 3.0.

Blow molding wholesale products generate pollutants.

During the blow molding and wholesale processing, plastic granules may emit a small amount of organic waste gas due to high temperatures, with the main component being non-total hydrocarbons.